US6364085B1 - Actuator with slipping prevention structure - Google Patents

Actuator with slipping prevention structure Download PDF

Info

Publication number
US6364085B1
US6364085B1 US09/592,415 US59241500A US6364085B1 US 6364085 B1 US6364085 B1 US 6364085B1 US 59241500 A US59241500 A US 59241500A US 6364085 B1 US6364085 B1 US 6364085B1
Authority
US
United States
Prior art keywords
rotation
engagement
regulation unit
rotation member
engagement state
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/592,415
Other languages
English (en)
Inventor
Naoki Ueno
Takayuki Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asmo Co Ltd
Original Assignee
Asmo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asmo Co Ltd filed Critical Asmo Co Ltd
Assigned to ASMO CO., LTD. reassignment ASMO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMOTO, TAKAYUKI, UENO, NAOKI
Application granted granted Critical
Publication of US6364085B1 publication Critical patent/US6364085B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action
    • F16D51/48—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/52—Rotating members in mutual engagement with non-parallel stationary axes, e.g. worm or bevel gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/02—Release mechanisms
    • F16D2127/04—Release mechanisms for manual operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms

Definitions

  • the present invention relates to an actuator having a slipping prevention unit which prevents a slipping of an output shaft due to an external force from a load side.
  • the actuator is suitably used for a vehicle brake device, for example.
  • an object of the present invention to provide an actuator having a slipping prevention unit which is constructed with a simple structure and prevents a slipping of an output shaft due to an external force from a load side.
  • actuator having an output shaft for driving a load includes a driving motor for driving and operating the output shaft, and a slipping prevention unit which prevents a slipping of the output shaft due to an external force from a load side.
  • the slipping prevention unit includes a rotation regulation unit having an engagement portion engaging with a rotation member, and a switching unit which electrically switches operation of the rotation regulation unit between an engagement state where the engagement portion of the rotation regulation unit engages with the rotation member, and a non-engagement state where the engagement portion is disengaged with the rotation member.
  • the engagement portion has a contact surface in a rotation direction for contacting the rotation member, and the rotation regulation unit is disposed so that at least one side rotation of the rotation member is prevented in the engagement state.
  • an end surface of the engagement portion in the rotation direction contacts a regulation wall of a housing for accommodating the slipping prevention unit. Therefore, in the engagement state, a rotation of the rotation regulation unit is accurately prevented, and the rotation of the rotation member is accurately prevented.
  • FIG. 4 is a cross-sectional view taken along line IV—IV in FIG. 2, showing the slipping prevention unit at a non-engagement position;
  • FIG. 5 is a cross-sectional view showing the slipping prevention unit at an engagement position according to the first embodiment
  • FIG. 6 is block diagram showing a brake controller for electrically controlling the brake device according to the first embodiment
  • FIG. 7 is a cross-sectional view showing an actuator according to a second preferred embodiment of the present invention.
  • FIG. 8 is an enlarged view showing a main part of the actuator according to the second embodiment.
  • FIG. 9 is a perspective view showing a slipping prevention unit according to the second embodiment.
  • FIG. 10 is a schematic view showing the slipping prevention unit according to the second embodiment.
  • FIG. 11 is a cross-sectional view showing a main part of the actuator at a first connection position of a first reduction gear according to the second embodiment
  • FIG. 12 is a cross-sectional view showing the main part of the actuator at a second connection position of the first reduction gear according to the second embodiment
  • FIG. 13A is a cross-sectional view showing an actuator according to a modification of the present invention
  • FIG. 13B is an enlarged view of a main part indicated by XIIIB in FIG. 13A according to the modification;
  • FIG. 14 is a perspective view showing a slipping prevention unit and a holding unit according to the modification.
  • FIG. 15 is a cross-sectional view taken along line XV—XV in FIG. 13, showing the slipping prevention unit and the holding unit at a non-engagement position;
  • FIG. 17 is a perspective view showing a holding unit according to an another modification of the present invention.
  • FIG. 20 is a cross-sectional view showing the slipping prevention unit and the holding unit at an engagement position according to the further another modification in FIG. 19 .
  • a drum 2 formed into a cylindrical shape having a bottom surface is fixed to a vehicle shaft (not shown), and a circular back plate 3 disposed at an opening side of the drum 2 is fixed to a bracket (not shown) for rotatably supporting the vehicle shaft.
  • Brake shoes 4 , 5 are disposed within the drum 2 .
  • Each of the brake shoes 4 , 5 is formed into a circular arc shape, and is held in the back plate 3 to be contact with and to be separated from an inner peripheral surface 2 a of the drum 2 .
  • One side ends of both the brake shoes 4 , 5 are coupled to each other through a adjuster 6 , and the other side ends of both the brake shoes 4 , 5 are connected to a stable pin 9 through return springs 7 , 8 , respectively.
  • the stable pin 9 is fixed to an outer peripheral portion of the back plate 3 .
  • the other side ends of the brake shoes 4 , 5 contact the stable pin 9 so that the brake shoes 4 , 5 are stopped at the positions.
  • the brake shoes 4 , 5 are positioned to be slightly away from the inner peripheral surface 2 a of the drum 2 .
  • connection bar 12 One end of an operation lever 10 is coupled to the brake shoe 4 at a side of the stable pin 9 through a connection pin 11 .
  • An end portion 12 a of a connection bar 12 is connected to a portion of the operation lever 10 , near the stable pin 9 .
  • An another end portion 12 b of the connection bar 12 is connected to a portion of the brake shoe 5 , near the stable pin 9 .
  • the other end of the operation lever 10 is connected to an operation shaft 21 operated by the actuator 20 .
  • the actuator 20 is attached to the back plate 3 using plural bolts 13 (e.g., three bolts in FIG. 1 ).
  • the position of the operation shaft 21 shown in FIG. 1 is a most protrusion position (i.e., home position) when a brake operation is not performed.
  • the actuator 20 When a brake operation is performed, the actuator 20 operates, the operation shaft 21 moves from the home position to the right side in FIG. 1 to be hidden.
  • the operation lever 10 is rotated around the connection pin 11 in a clockwise direction in FIG. 1, and is rotated around the end portion 12 a of the connection bar 12 in the same rotation direction. Therefore, the brake shoes 4 , 5 are expanded while opposing the spring forces of the return springs 7 , 8 , at the side of the stable pin 9 .
  • the brake shoes 4 , 5 contact the inner peripheral surface 2 a of the drum 2 , so that a friction force is generated between the brake shoes 4 , 5 and the drum 2 . Due to the friction force, the brake shoes 4 , 5 are rotated in the same rotation direction as the drum 2 .
  • the actuator 20 includes a driving motor 22 , and a brake driving portion 23 which converts the rotation operation of the driving motor 22 to a reciprocating line operation of the operation shaft 21 .
  • the driving motor 22 is integrally assembled to a housing 24 of the brake driving portion 23 , and the housing 24 and the driving motor 22 are fixed to the back plate 3 .
  • a pinion 25 is attached to a rotation shaft 22 a of the driving motor 22 , and is engaged with a first reduction gear 26 .
  • the first reduction gear 26 is engaged with a second reduction gear 27 having an output shaft portion 27 a in which a screw hole (not shown) is provided in an axial direction.
  • a slipping prevention unit 30 is disposed within the housing 24 .
  • the slipping prevention unit 30 switches operation of the pinion 25 from a rotatable state to a non-rotatable state so that a slipping of the output shaft portion 27 a due to an external force input from a side (load side) of the output shaft portion 27 a is prevented.
  • the regulation gear 32 includes a first engagement portion 32 a engaged with the pinion 31 a of the switching motor 31 , and a second engagement portion 32 b engaged with the pinion 25 of the driving motor 22 .
  • the second engagement portion 32 b protrudes from the first engagement portion 32 a to an outside to have a circular arc shape.
  • the regulation gear 32 is rotated by the operation of the switching motor 31 , and the rotation of the regulation gear 32 is regulated in a predetermined angle by a regulation wall 24 a formed in the housing 24 . Further, the regulation gear 32 is operated by the switching motor 31 to be switched between an engagement position, shown in FIG. 5 where the second engagement portion 32 b engages with the pinion 25 of the driving motor 22 , and a non-engagement position shown in FIG. 4 where the second engagement portion 32 b does not engage with the pinion 25 of the driving motor 22 .
  • the regulation gear 32 is disposed so that the non-engagement position of the regulation gear 32 is maintained by the self-weight.
  • a hexagonal tool connection hole 32 c into which a tool such as a hexagonal spanner is inserted is formed in the regulation gear 32 at a side opposite to the first reduction gear 26 .
  • an insertion hole 24 b is formed in the housing 24 at a position corresponding to the tool connection hole 32 c to penetrate through from an outside of the housing 24 until the regulation gear 32 .
  • the insertion hole 24 b is a screw hole into which a bolt 33 is screwed. A top end of the bolt 33 approximately contacts the regulation gear 32 , so that thrusting load of the regulation gear 32 is received.
  • the arrow “X” indicates a side of the drum 2
  • the arrow “Y” indicates a side opposite the drum 2 .
  • the brake device 1 is controlled by a brake controller 40 mounted on a vehicle, and electrical power from a vehicle battery 41 is supplied to the brake controller 40 .
  • a stepping amount detector 42 for detecting a stepping amount of a brake pedal due to a driver is connected to the controller 40 so that a stepping signal corresponding to the stepping amount of the brake pedal is input from the stepping amount detector 42 to the controller 40 .
  • a parking brake operation switch 43 mounted on the vehicle is also connected to the controller 40 so that a parking brake operation signal is input from the parking brake operation switch 43 to the controller 40 .
  • a parking brake mode is selected from a normal brake mode, and the driving motor 22 and the switching motor 31 are controlled in accordance with the selected mode.
  • the controller 40 controls the switching motor 31 so that the regulation gear 32 is disposed to the non-engagement position shown in FIG. 4 and the driving motor 22 is freely operated. In this case, because the regulation gear 32 is maintained at the non-engagement position by the self-weight, the controller 40 stops an electrical supply to the switching motor 31 .
  • the driving motor 22 is rotated in the rotation direction A in FIG. 4 by the controller 40 . Therefore, the output shaft portion 27 a is rotated by the driving motor 22 through the pinion 25 , the first reduction gear 26 and the second reduction gear 27 , and the operation shaft 21 is hidden.
  • the brake shoes 4 , 5 are expanded by the operation lever 10 while opposing the spring forces of the springs 7 , 8 , and both the brakes 4 , 5 press-contact the inner peripheral surface 2 a of the drum 2 . That is, in this case, the braking force of the brake device 1 is increased.
  • the driving motor 22 is controlled by the controller 40 to be rotated in the direction shown by B in FIG. 4 . Therefore, the output shaft portion 27 a is also rotated by the driving motor 22 so that the operation shaft 21 protrudes.
  • the operation lever 10 is rotated so that the brake shoes 4 , 5 are returned by the spring forces of the springs 7 , 8 , and the brake shoes 4 , 5 move in a direction to be away from the inner peripheral surface 2 a of the drum 2 .
  • the braking force of the brake device 1 is reduced.
  • the controller 40 controls the driving motor 22 based on the stepping amount signal corresponding to the stepping amount of the brake pedal, and a contact state of the brake shoes 4 , 5 relative to the brake drum 2 is changed. Therefore, press force of the brake shoes 4 , 5 relative to the brake drum 2 is changed, and the brake force of the brake device 1 is controlled.
  • the driving motor 22 is controlled by the controller 40 to be rotated in the rotation direction A so that braking force (contact pressure) of the brake shoes 4 , 5 relative to the brake drum 2 becomes larger than a predetermined value. That is, the driving motor 22 is rotated in the rotation direction A until a brake force necessary for a vehicle parking is obtained.
  • the controller 40 controls the switching motor 31 so that the regulation gear 32 is rotated in the clockwise direction from the non-engagement position shown in FIG. 4 to the engagement position where the regulation gear 32 engages with the pinion 25 as shown in FIG. 5 .
  • the end surface of the second engagement portion 32 b in the rotation direction contacts the regulation wall 24 a of the housing 24 . Therefore, the rotation of the pinion 25 of the driving motor 22 in the rotation direction B is prohibited. In this case, an electrical power supply to the switching motor 31 is stopped by the controller 40 .
  • an opposite force for separating the brake shoes 4 , 5 from the brake drum 2 is always applied to the protrusion direction of the operation shaft 21 (i.e., left direction in FIG. 1) through the operation lever 10 .
  • the opposite force is a force for rotating the pinion 25 of the driving motor 22 in the rotation direction B through the output shaft portion 27 a, and the gears 27 and 26 .
  • the rotation of the pinion 25 of the driving motor 22 in the rotation direction B is prohibited by the slipping prevention unit 30 , a slipping of the output shaft portion 27 a is prevented.
  • the operation shaft 21 is not moved in the protrusion direction (i.e., left direction in FIG.
  • the controller 40 controls the driving motor 22 so that the driving motor 22 is rotated in the rotation direction A and the press force of the brake shoes 4 , 5 is increased. Thereafter, the controller 40 controls the switching motor 31 so that the regulation gear 32 is moved to the non-engagement position shown in FIG. 4 where the regulation gear 32 does not engage with the pinion 25 . Then, an electrical power supplying to the switching motor 31 is stopped. At this time, when the brake pedal is not stepped, the driving motor 22 is rotated in the rotation direction B by the controller 40 , and the brake shoes 4 , 5 are moved to be away from the brake drum 2 . Thus, the brake device 1 is possible to perform the normal brake operation.
  • the parking brake can be manually released in the first embodiment of the present invention. That is, the bolt 33 shown in FIG. 2 is detached, and a tool such as the hexagonal adjustable spanner is inserted into the insertion hole 24 b and further inserted into the connection hole 32 c of the regulation gear 32 . Thereafter, the regulation gear 32 is rotated by the tool from the engagement position to the non-engagement position. Therefore, the pinion 25 of the driving motor 22 becomes free, and is rotated due to an opposing force for separating the brake shoes 4 , 5 from the brake drum 2 . As a result, the parking brake is released.
  • the slipping prevention unit 30 includes the regulation gear 32 having the second engagement portion 32 b engaging with the pinion 25 , and the switching motor 31 .
  • the regulation gear 32 is rotated by the switching motor 31 so that the engagement position and the non-engagement position is switched.
  • the second engagement portion 32 b and the pinion 25 engage with each other and one side rotation of the regulation gear 32 is regulated.
  • the non-engagement position the second engagement portion 32 b and the pinion 25 are disengaged.
  • the slipping prevention unit 30 has a simple structure, and number of components of the actuator 20 is reduced.
  • the rotation of the pinion 25 is regulated by the slipping prevention unit 30 in order to prevent the slipping of the output shaft portion 27 a, a special component for preventing the slipping of the output shaft portion 27 a is not necessary. Therefore, the number of components of the actuator 20 is further reduced. Because the pinion 25 is an input step of a deceleration unit, the slipping of the output shaft portion 27 a is prevented with a small torque. Therefore, the size of the slipping prevention unit 30 is reduced. Further, because the slipping prevention unit 30 is disposed adjacent to the pinion 25 , the structure of the actuator 20 in the axial direction becomes simple.
  • the regulation gear 32 is disposed so that the regulation gear 32 positioned at the non-engagement position is maintained by the self-weight even when electrical power is not supplied to the switching motor 31 . Therefore, a specific mechanism for maintaining the regulation gear 32 at the non-engagement position is not necessary, and the structure of the actuator 20 becomes simple.
  • the rotation force is always applied to the direction in which the end surface of the second engagement portion 32 b contacts the regulation wall 24 a of the housing 24 . Therefore, even when the electrical power supplying to the switching motor 31 is shut off, the engagement between the regulation gear 32 and the pinion 25 are not released during the parking brake mode. Thus, during the parking mode, electrical power is not consumed for the switching motor 31 (actuator 20 ), and the battery 41 can be used for a long time.
  • the tool connection hole 32 c is provided in the regulation gear 32 , and it is possible to manually rotate the regulation gear 32 from the engagement position to the non-engagement position.
  • the parking brake can be manually released.
  • FIGS. 7-12 A second preferred embodiment of the present invention will be now described with reference to FIGS. 7-12.
  • a part structure of the actuator is different as compared with the first embodiment. Therefore, in the second embodiment, an actuator 50 shown in FIG. 7 is mainly described. Further, components similar to those in the first embodiment are indicated with the same reference number, and the explanation thereof is omitted.
  • FIG. 7 shows the actuator 50 of the second embodiment.
  • the actuator 50 includes a driving motor 22 , and a brake driving portion 51 which converts the rotation operation of the driving motor 22 to a reciprocating line operation of the driving shaft 21 .
  • the driving motor 22 is integrally assembled to a housing 52 of the brake driving portion 51 , and the housing 52 and the driving motor 22 are fixed to the back plate 3 .
  • a pinion 53 is attached to the rotation shaft 22 a of the driving motor 22 , and is engaged with a first reduction gear 54 .
  • the first reduction gear 54 is engaged with a second reduction gear 55 having an output shaft portion 55 a in which a screw hole (not shown) in an axial direction is provided.
  • the worm portion 21 b is screwed into the screw hole of the output shaft portion 55 a.
  • each of the pinion 53 and the first and second reduction gears 54 , 55 is a helical gear.
  • the pinion 53 and the second reduction gear 55 are torsion gears wrung in the clockwise direction toward the arrow E direction
  • the first reduction gear 54 is a torsion gear wrung in the counterclockwise direction toward the arrow E direction. Therefore, in the second embodiment, when a rotation force in the rotation direction D is applied to the first reduction gear 54 , a thrust force in the arrow E direction is applied to the first reduction gear 54 .
  • FIGS. 8-12 show a slipping prevention unit 60 of the second embodiment.
  • the slipping prevention unit 60 switches the operation of the first reduction gear 54 from a rotatable state to a non-rotatable state so that a slipping of the output shaft portion 55 a due to an external force input from the output shaft portion 55 a (load side) is prevented.
  • the first reduction gear 54 includes a complete gear portion 54 a and an incomplete gear portion 54 b.
  • the complete gear portion 54 a is formed into a complete gear shape.
  • a gear shape of the incomplete gear portion 54 b is not completely formed, and a gear recess of the incomplete gear portion 54 b is gradually becomes shallower.
  • the incomplete gear portion 54 b is disposed of a back side of the complete gear portion 54 a, relative to the arrow E direction.
  • the first reduction gear 54 is rotatably held in a shaft 61 .
  • the shaft 61 is held by a bolt 62 which is screwed into the housing 52 from an outside of the housing 52 .
  • a four-sided protrusion 62 a is formed at a top end of the bolt 62 , and is inserted into an insertion hole 61 a of the shaft 61 , as shown in FIG. 9 . That is, the protrusion 62 a of the bolt 62 is inserted into the insertion hole 61 a of the shaft 61 so that the shaft 61 is movable in the axial direction while being not rotatable.
  • a screw portion 61 b is provided on the outer peripheral surface of the shaft 61 , and is connected to a worm wheel 63 having a screw hole 63 a in the axial direction.
  • the worm wheel 63 is disposed to be engaged with a worm 64 a provided in a rotation shaft of the switching motor 64 .
  • the worm wheel 63 is held by the housing 52 and a stopper 65 attached to the housing 52 , to be not movable in the axial direction.
  • circular protrusions 63 b contacting the housing 52 and the stopper 65 are formed at both end surfaces of the worm wheel 63 .
  • the shaft 61 (first reduction gear 54 ) moves in the axial direction through the worm 64 a and the worm wheel 63 .
  • the first reduction gear 54 is switched between a first connection position shown in FIG. 11 and a second connection position shown in FIG. 12 .
  • the pinion 53 and the second reduction gear 55 are only connected to the complete gear portion 54 a of the first reduction gear 54 .
  • the pinion 53 and the second gear portion 55 are connected to both the complete gear portion 54 a and the incomplete gear portion 54 b of the first reduction portion 54 .
  • the screw turn direction of the bolt 62 is opposite to that the screw portion 61 b of the shaft 61 .
  • the screw turn direction of the bolt 62 toward the arrow E direction is moved in the clockwise direction
  • the screw turn direction of the screw portion 61 b of the shaft 61 toward the arrow E direction is moved in the counterclockwise direction.
  • the shaft 61 is moved in the arrow F direction opposite to the arrow E direction, through the worm wheel 63 and the screw hole 63 , and the first reduction gear 54 (i.e., shaft 61 ) is moved in the arrow F direction.
  • the operation of the brake device 1 is controlled by the controller 40 (FIG. 6) to be switched between the normal brake mode and the parking brake mode.
  • the driving motor 22 and the switching motor 64 are controlled by the controller 40 .
  • the controller 40 controls the switching motor 64 so that the first reduction gear 54 is disposed at the first connection position shown in FIG. 11 .
  • the pinion 53 and the second reduction gear 55 are connected to only the complete gear portion 54 a of the first reduction gear 54 , and the driving motor 22 is operated.
  • the controller 40 controls the driving motor 22 in accordance with the stepping amount, and controls the brake force of the brake unit 1 , similarly to the first embodiment.
  • the driving motor 22 is controlled by the controller 40 to be rotated in the rotation direction A so that braking force (contact pressure) of the brake shoes 4 , 5 relative to the brake drum 2 becomes larger than a predetermined value. That is, the driving motor 22 is rotated in the rotation direction A until a brake force necessary for a vehicle parking is obtained.
  • the controller 40 controls the switching motor 64 so that the first reduction gear 54 is set at the second connection position shown in FIG. 12 . At this time, the incomplete gear portion 54 b of the first reduction gear 54 is press-fitted to the second reduction gear 55 and the pinion 53 . Therefore, the rotation of the first reduction gear 54 becomes difficult.
  • a reaction force for separating the brake shoes 4 , 5 from the brake drum 2 is always applied to the protrusion direction (left direction in FIG. 1) of the operation shaft 21 through the operation lever 10 .
  • the reaction force is for rotating the first reduction gear 54 in the rotation direction D through the output shaft portion 55 a.
  • a thrust force is applied to the first reduction gear 54 in the arrow E direction due to the pinion 53 and the first and second reduction gears 54 , 55 .
  • the second reduction gear 55 and the pinion 53 are deeply presfitted into the incomplete gear portion 54 b of the first reduction gear 54 . Therefore, the rotation of the first reduction gear 54 becomes impossible. That is, at the second connection position, even when a rotation force is applied to the output shaft portion 55 a, the rotation of the first reduction gear 54 in the rotation direction D is prohibited, and a slipping of the output shaft portion 55 a is prevented.
  • a necessary braking force for parking is maintained in the brake device 1 without moving the operation shaft 21 in the protrusion direction (left direction in FIG. 1 ).
  • the rotation force in the rotation direction D is always applied to the first reduction gear 54 through the output shaft portion 55 a. Therefore, the thrust force in the arrow E direction is always applied to the first reduction gear 54 , and the incomplete gear portion 54 a of the first reduction gear 54 are deeply press-fitted to the second reduction gear 55 and the pinion 53 . As a result, even when electrical power supplying to the switching motor 64 is stopped, the first reduction gear 54 is maintained at the second connection position.
  • the controller 40 controls the driving motor 22 so that the driving motor 22 is rotated in the rotation direction A and the press force of the brake shoes 4 , 5 is increased.
  • a thrust force in the arrow F direction is applied to the first reduction gear 54 , and the press-fitting of the incomplete gear portion 54 b relative to the second reduction gear 55 and the pinion 53 is released.
  • the controller 40 controls the switching motor 64 so that the first reduction gear 54 is set at the first connection position shown in FIG. 11 .
  • the driving motor 22 is rotated in the rotation direction B by the controller 40 , and the brake shoes 4 , 5 are moved to be away from the brake drum 2 .
  • the brake device 1 is possible to perform the normal brake operation.
  • the parking brake can be manually released in the second embodiment of the present invention. That is, when the bolt 62 shown in FIGS. 7, 11 , 12 is rotated in a detaching direction (the rotation direction C), the shaft 61 is moved in the arrow F direction through the worm wheel 63 .
  • the first reduction gear 54 is moved from the second connection position to the first connection position, the pinion 53 of the driving motor 22 becomes free, and is rotated due to the reaction force for separating the brake shoes 4 , 5 from the brake drum 2 . As a result, the parking brake is released.
  • the slipping prevention unit 60 includes the regulation gear 54 , and the switching motor 64 .
  • the switching motor 64 switches operation of the first reduction gear 54 between the first connection position and the second connection position through the shaft 61 and the worm wheel 63 .
  • the slipping prevention unit 60 has a simple structure, and number of components of the actuator 50 is reduced.
  • the first reduction gear 54 is moved from the second connection position to the first connection position. Therefore, it is possible to manually release the parking brake.
  • an engagement recess 32 d is provided at a side surface of the first engagement portion 32 a of the regulation gear 32 , and is gradually curved toward a bottom side.
  • a receiving recess portion 24 c is provided in the housing 24 , and an engagement pin 34 for engaging with the engagement recess 32 d of the regulation gear 32 is held in the receiving recess portion 24 c of the housing 24 to be movable in the axial direction when the regulation gear 32 is disposed at the non-engagement position shown in FIG. 15 .
  • the engagement pin 34 is made of metal having a high heat resistance, and a top end of the engagement pin 34 engaging with the engagement recess 32 d has a round shape.
  • the engagement pin 34 is biased at a side of the regulation gear 32 by a spring 35 . That is, the engagement pin 34 , the spring 35 and the engagement recess 32 d construct a holding unit of the regulation gear 32 at the non-engagement position.
  • the engagement recess 32 d is provided at the side surface of the first engagement portion 32 a.
  • the engagement recess 32 d may be provided in a side surface of the second engagement portion 32 b, as shown in FIG. 17 .
  • the holding force of the regulation gear 32 becomes larger.
  • the holding unit for holding the regulation gear 32 at the non-engagement position may be constructed by the other structure.
  • the regulation gear 32 may be made of iron, and the second engagement portion 32 b may be moved by a permanent magnet and the like so that the regulation gear 32 is accurately disposed at the non-engagement position.
  • the rotation of the pinion 25 is regulated by the regulation gear 32 .
  • the rotation of the first and second reduction gears 26 , 27 may be regulated by the regulation gear 32 .
  • a rotation member rotated together with the driving motor 22 except for the pinion 25 and the gears 26 , 27 , may be engaged with the regulation gear 32 .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)
US09/592,415 1999-06-14 2000-06-13 Actuator with slipping prevention structure Expired - Fee Related US6364085B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP16696299 1999-06-14
JP11-166962 1999-06-14
JP32147999 1999-11-11
JP11-321479 1999-11-11

Publications (1)

Publication Number Publication Date
US6364085B1 true US6364085B1 (en) 2002-04-02

Family

ID=26491149

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/592,415 Expired - Fee Related US6364085B1 (en) 1999-06-14 2000-06-13 Actuator with slipping prevention structure

Country Status (2)

Country Link
US (1) US6364085B1 (de)
DE (1) DE10029013B4 (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6684988B2 (en) * 1999-12-07 2004-02-03 Skf Engineering And Research Centre B.V. Drum brake and electric actuator therefor
US20050109567A1 (en) * 2003-10-22 2005-05-26 Dietmar Baumann Electromechanical friction brake
US20050184306A1 (en) * 2000-06-20 2005-08-25 Parker Ian D. Multilayer structures as stable hole-injecting electrodes for use in high efficiency organic electronic devices
US20050217952A1 (en) * 2004-03-31 2005-10-06 Takuya Usui Electric brake
WO2007089300A2 (en) * 2005-10-31 2007-08-09 Kelsey-Hayes Company Electric actuator unit for a vehicle brake assembly
US20080245624A1 (en) * 2007-04-05 2008-10-09 Shaw Schuyler S Latching device for electro-mechanical actuators
US20100236879A1 (en) * 2006-08-09 2010-09-23 Rainer Kober Method for releasing a parking brake of a motor vehicle
US20140231194A1 (en) * 2003-12-22 2014-08-21 Brose Fahrzeugteile Gmbh & Co. Kg Setting device, particularly a motor vehicle parking brake
US20140345989A1 (en) * 2013-05-22 2014-11-27 Advics Co., Ltd. Electric parking brake device
US9772029B2 (en) 2015-07-09 2017-09-26 Akebono Brake Industry Co., Ltd. Planetary carrier with spring clutch
EP2604881A3 (de) * 2011-12-14 2018-04-11 Akebono Brake Industry Co., Ltd. Trommelbremsartige elektrische Parkbremsvorrichtung
EP3521117A1 (de) * 2018-02-06 2019-08-07 Foundation Brakes France Elektromechanischer bremsaktuator eines fahrzeugs, der einen mechanischen sollbruchbereich umfasst
CN113661103A (zh) * 2019-04-12 2021-11-16 株式会社万都 电子驻车制动器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3096013B1 (fr) * 2019-05-13 2021-09-17 Foundation Brakes France Ensemble pour frein de vehicule automobile comprenant un support de frein, un motoreducteur et un boitier de motoreducteur assemble au support de frein

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024299A (en) * 1990-05-17 1991-06-18 General Motors Corporation Electric drum brake
US5074388A (en) * 1989-03-02 1991-12-24 Lucas Industries Public Limited Company Vehicle braking system
US5219049A (en) 1991-06-24 1993-06-15 General Motors Corporation Electrically actuated electric brake with adjuster
US5310026A (en) 1992-10-19 1994-05-10 General Motors Corporation Electric drum brake
US5785157A (en) * 1997-03-27 1998-07-28 General Motors Corporation Park brake apparatus for vehicle electric brake
US5855255A (en) 1997-03-27 1999-01-05 General Motors Corporation Electric drum brake

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH45343A (fr) * 1908-12-03 1909-11-01 Golay C H Encliquetage pour pièces d'horlogerie
GB2304838B (en) * 1995-09-12 1998-12-09 Delphi France Automotive Sys Electrically operated parking brake
DE19750420A1 (de) * 1997-11-14 1999-05-20 Bayerische Motoren Werke Ag Elektrisch betätigbare Bremse für ein Kraftfahrzeug
DE19804454A1 (de) * 1997-11-21 1999-05-27 Itt Mfg Enterprises Inc Elektromechanisch betätigbare Scheibenbremse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5074388A (en) * 1989-03-02 1991-12-24 Lucas Industries Public Limited Company Vehicle braking system
US5024299A (en) * 1990-05-17 1991-06-18 General Motors Corporation Electric drum brake
US5219049A (en) 1991-06-24 1993-06-15 General Motors Corporation Electrically actuated electric brake with adjuster
US5310026A (en) 1992-10-19 1994-05-10 General Motors Corporation Electric drum brake
US5785157A (en) * 1997-03-27 1998-07-28 General Motors Corporation Park brake apparatus for vehicle electric brake
US5855255A (en) 1997-03-27 1999-01-05 General Motors Corporation Electric drum brake

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6684988B2 (en) * 1999-12-07 2004-02-03 Skf Engineering And Research Centre B.V. Drum brake and electric actuator therefor
US20050184306A1 (en) * 2000-06-20 2005-08-25 Parker Ian D. Multilayer structures as stable hole-injecting electrodes for use in high efficiency organic electronic devices
US20050109567A1 (en) * 2003-10-22 2005-05-26 Dietmar Baumann Electromechanical friction brake
US10071718B2 (en) * 2003-12-22 2018-09-11 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Setting device, particularly a motor vehicle parking brake
US20140231194A1 (en) * 2003-12-22 2014-08-21 Brose Fahrzeugteile Gmbh & Co. Kg Setting device, particularly a motor vehicle parking brake
US20100101900A1 (en) * 2004-03-31 2010-04-29 Takuya Usui Electric brake
US20050217952A1 (en) * 2004-03-31 2005-10-06 Takuya Usui Electric brake
US8678147B2 (en) 2004-03-31 2014-03-25 Hitachi, Ltd. Electric brake
US7677367B2 (en) 2004-03-31 2010-03-16 Hitachi, Ltd. Electric brake
CN101627221B (zh) * 2005-10-31 2012-06-20 凯尔西-海耶斯公司 用于车辆制动器组件的电致动器单元
WO2007089300A2 (en) * 2005-10-31 2007-08-09 Kelsey-Hayes Company Electric actuator unit for a vehicle brake assembly
US8011482B2 (en) 2005-10-31 2011-09-06 Kelsey-Hayes Company Electric actuator unit for a vehicle brake assembly
US20090260929A1 (en) * 2005-10-31 2009-10-22 Brian Boyle Electric Actuator Unit for a Vehicle Brake Assembly
WO2007089300A3 (en) * 2005-10-31 2009-05-14 Kelsey Hayes Co Electric actuator unit for a vehicle brake assembly
US20100236879A1 (en) * 2006-08-09 2010-09-23 Rainer Kober Method for releasing a parking brake of a motor vehicle
US20080245624A1 (en) * 2007-04-05 2008-10-09 Shaw Schuyler S Latching device for electro-mechanical actuators
EP2604881A3 (de) * 2011-12-14 2018-04-11 Akebono Brake Industry Co., Ltd. Trommelbremsartige elektrische Parkbremsvorrichtung
US20140345989A1 (en) * 2013-05-22 2014-11-27 Advics Co., Ltd. Electric parking brake device
US9555779B2 (en) * 2013-05-22 2017-01-31 Advics Co., Ltd. Electric parking brake device
US9772029B2 (en) 2015-07-09 2017-09-26 Akebono Brake Industry Co., Ltd. Planetary carrier with spring clutch
EP3521117A1 (de) * 2018-02-06 2019-08-07 Foundation Brakes France Elektromechanischer bremsaktuator eines fahrzeugs, der einen mechanischen sollbruchbereich umfasst
FR3077608A1 (fr) * 2018-02-06 2019-08-09 Foundation Brakes France Actionneur electromecanique de frein de vehicule, comprenant une region de rupture mecanique
CN113661103A (zh) * 2019-04-12 2021-11-16 株式会社万都 电子驻车制动器
CN113661103B (zh) * 2019-04-12 2024-05-17 汉拿万都株式会社 电子驻车制动器

Also Published As

Publication number Publication date
DE10029013A1 (de) 2000-12-28
DE10029013B4 (de) 2008-03-27

Similar Documents

Publication Publication Date Title
US6364085B1 (en) Actuator with slipping prevention structure
US9568058B2 (en) Disc brake
JP3559096B2 (ja) リニア・アクチュエータ
EP0520525B1 (de) Elektrisch betätigte Fahrzeugbremse
US8196714B2 (en) Single motor electronic wedge brake system generating solenoid assisting force
US7987950B2 (en) Single motor electro wedge brake system using solenoid mechanism for implementing additional functions
US5949168A (en) Electric motor assembly and a brake actuator incorporating said electric motor assembly
US9174622B2 (en) Parking brake system
US8151948B2 (en) Single motor electronic wedge brake system locking parking force
US6446768B2 (en) Brake device actuator and brake device having the same
JP2004528221A (ja) 電動駐車ブレーキ作動アセンブリ
US11787379B2 (en) Electronic parking brake system
EP1231119B1 (de) Feststellbremssystem für Fahrzeuge
JP2007098969A (ja) 電動倍力装置
US5934430A (en) Electrically operated clutch
US6065581A (en) Camming manual lever for pull-out load
CN111503187A (zh) 致动器和具有致动器的机电盘式制动器
US20070102249A1 (en) Automatically locking parking brake for a vehicle
JP3920536B2 (ja) アクチュエータ
US6779640B2 (en) Driving force transmitting clutch device
US11932214B2 (en) Parking actuator and electromechanical brake including the same
US20230160469A1 (en) Release device
JP3892242B2 (ja) ブレーキ装置
JP2003156080A (ja) 車両用ドラムブレーキ装置
WO2018003191A1 (ja) ディスクブレーキ

Legal Events

Date Code Title Description
AS Assignment

Owner name: ASMO CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:UENO, NAOKI;YAMAMOTO, TAKAYUKI;REEL/FRAME:011067/0699;SIGNING DATES FROM 20000614 TO 20000619

CC Certificate of correction
FPAY Fee payment

Year of fee payment: 4

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20100402